|Energy Density vs. Power Density for the 18650HP1 Click to enlarge.|
Li-ion start-up Imara Corporation (earlier post) announced that its first 18650 high-power lithium nickel manganese cobalt oxide cells are now available. Imara is providing battery cells to customers in the power tool, outdoor power equipment and transportation markets.
The cells offer a volumetric energy density of 350 Wh/L, and a gravimetric density of 135 Wh/kg. Nominal capacity is 1510 mAh, and nominal cell voltage is 3.7V. The 18650HP1 offers a high lifetime energy delivery of 6.8 kWh, according to Imara.
Imara’s technology is materials-agnostic; with the lithiated nickel-manganese-cobalt (NMC) oxide cathode, the technology allows Imara to get a high rate without blending the NMC with a manganese spinel (as Sony and Sanyo do).
The process creates a cathode with very low impedance, stable cycle life and high current carrying capacity. The initial core technology, exclusively licensed from the Stanford Research Institute (SRI), was developed and funded in conjunction with the US Department of Energy as part of the Partnership for the Next Generation Vehicle (PNGV) initiative.
Imara says that it is ramping up high-volume US-based production of electrodes, leveraging its proprietary materials technology. The company says it is also developing large format cells for the automotive and grid storage markets.